Strain extn/abdr musc/fasc/tend of thmb at forarm lv, subs

This code signifies a muscle, fascia, or tendon strain affecting the extensor or abductor groups of an unspecified thumb, specifically at the forearm level. It indicates that the patient is receiving follow-up care for an injury that has already been treated initially.

Apply this code when a patient presents for subsequent treatment, such as physical therapy, follow-up appointments, or medication refills, for a previously diagnosed strain of the thumb's extensor or abductor muscles, fascia, or tendons originating in the forearm. This is appropriate for any encounter after the initial treatment of the injury.

• Ensure the documentation clearly specifies a "subsequent encounter" for the injury.
• Verify that the strain involves the extensor or abductor muscles/tendons of the thumb and is localized to the forearm level.
• If the laterality (left or right thumb) is documented, a more specific code should be used.